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Ether, any of a class of organic compounds characterized by an oxygen atom bonded to two alkyl or aryl groups. Ethers are similar in structure to alcohols, and both ethers and alcohols are similar in structure to water. In an alcohol one hydrogen atom of a water molecule is replaced by an alkyl group, whereas in an ether both hydrogen atoms are replaced by alkyl or aryl groups. At room temperature, ethers are pleasant-smelling colourless liquids.
Alcohols, Phenols, and Ethers. An alcohol is an organic compound that contains the hydroxyl group (-OH) attached to. an alkyl group. They are essentially alkanes in which a single hydrogen has been replaced. with an âOH group. A phenol has an âOH group bonded directly to a benzene ring. An. ether has an oxygen atom bound to two alkyl groups.